let a = document.querySelectorAll(".denglu a")
let tab = document.querySelectorAll(".tabo")
console.log(a, tab);
for (let i = 0; i < a.length; i++) {
    a[i].addEventListener("click", function () {
        for (let v = 0; v < a.length; v++) {
            a[v].classList.remove("on")
            tab[v].style.opacity = "0";
            tab[v].style.zIndex = "-5"
        }
        a[i].classList.add("on")
        tab[i].style.opacity = "1";
        tab[i].style.zIndex = "99"
    })
}